x86_64: Function renaming lapic_init -> lapic_map
[dragonfly.git] / bin / sh / var.c
CommitLineData
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1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)var.c 8.3 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/var.c,v 1.15.2.2 2002/08/27 01:36:28 tjr Exp $
f2aa3fa5 38 * $DragonFly: src/bin/sh/var.c,v 1.15 2007/01/14 17:29:58 pavalos Exp $
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39 */
40
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41#include <unistd.h>
42#include <stdlib.h>
43
44/*
45 * Shell variables.
46 */
47
48#include <locale.h>
6a25bb17 49#include <paths.h>
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50
51#include "shell.h"
52#include "output.h"
53#include "expand.h"
54#include "nodes.h" /* for other headers */
55#include "eval.h" /* defines cmdenviron */
56#include "exec.h"
57#include "syntax.h"
58#include "options.h"
59#include "mail.h"
60#include "var.h"
61#include "memalloc.h"
62#include "error.h"
63#include "mystring.h"
64#include "parser.h"
65#ifndef NO_HISTORY
66#include "myhistedit.h"
67#endif
68
69
70#define VTABSIZE 39
71
72
73struct varinit {
74 struct var *var;
75 int flags;
934863d7 76 const char *text;
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77 void (*func)(const char *);
78};
79
80
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81#ifndef NO_HISTORY
82struct var vhistsize;
83#endif
84struct var vifs;
85struct var vmail;
86struct var vmpath;
87struct var vpath;
88struct var vppid;
89struct var vps1;
90struct var vps2;
0d5aaed6 91struct var vps4;
984263bc 92struct var vvers;
f8903466 93STATIC struct var voptind;
984263bc 94
f8903466 95STATIC const struct varinit varinit[] = {
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96#ifndef NO_HISTORY
97 { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=",
98 sethistsize },
99#endif
100 { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n",
101 NULL },
102 { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
103 NULL },
104 { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
105 NULL },
3efac031 106 { &vpath, VSTRFIXED|VTEXTFIXED|VEXPORT,
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107#ifdef _PATH_DEFPATH
108 "PATH=" _PATH_DEFPATH,
109#else
110 "PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/pkg/bin:/usr/pkg/sbin",
111#endif
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112 changepath },
113 { &vppid, VSTRFIXED|VTEXTFIXED|VUNSET, "PPID=",
114 NULL },
115 /*
116 * vps1 depends on uid
117 */
118 { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
119 NULL },
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120 { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ",
121 NULL },
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122 { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
123 getoptsreset },
124 { NULL, 0, NULL,
125 NULL }
126};
127
f8903466 128STATIC struct var *vartab[VTABSIZE];
984263bc 129
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130STATIC struct var **hashvar(const char *);
131STATIC int varequal(const char *, const char *);
132STATIC int localevar(const char *);
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133
134/*
492efe05 135 * Initialize the variable symbol tables and import the environment.
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136 */
137
138#ifdef mkinit
139INCLUDE "var.h"
934863d7 140MKINIT char **environ;
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141INIT {
142 char **envp;
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143
144 initvar();
145 for (envp = environ ; *envp ; envp++) {
146 if (strchr(*envp, '=')) {
147 setvareq(*envp, VEXPORT|VTEXTFIXED);
148 }
149 }
150}
151#endif
152
153
154/*
155 * This routine initializes the builtin variables. It is called when the
156 * shell is initialized and again when a shell procedure is spawned.
157 */
158
159void
160initvar(void)
161{
162 char ppid[20];
163 const struct varinit *ip;
164 struct var *vp;
165 struct var **vpp;
166
167 for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
168 if ((vp->flags & VEXPORT) == 0) {
169 vpp = hashvar(ip->text);
170 vp->next = *vpp;
171 *vpp = vp;
934863d7 172 vp->text = strdup(ip->text);
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173 vp->flags = ip->flags;
174 vp->func = ip->func;
175 }
176 }
177 /*
178 * PS1 depends on uid
179 */
180 if ((vps1.flags & VEXPORT) == 0) {
181 vpp = hashvar("PS1=");
182 vps1.next = *vpp;
183 *vpp = &vps1;
934863d7 184 vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
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185 vps1.flags = VSTRFIXED|VTEXTFIXED;
186 }
187 if ((vppid.flags & VEXPORT) == 0) {
188 fmtstr(ppid, sizeof(ppid), "%d", (int)getppid());
189 setvarsafe("PPID", ppid, 0);
190 }
191}
192
193/*
194 * Safe version of setvar, returns 1 on success 0 on failure.
195 */
196
197int
492efe05 198setvarsafe(const char *name, const char *val, int flags)
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199{
200 struct jmploc jmploc;
201 struct jmploc *volatile savehandler = handler;
202 int err = 0;
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203
204 if (setjmp(jmploc.loc))
205 err = 1;
206 else {
207 handler = &jmploc;
208 setvar(name, val, flags);
209 }
210 handler = savehandler;
211 return err;
212}
213
214/*
fab926b5 215 * Set the value of a variable. The flags argument is stored with the
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216 * flags of the variable. If val is NULL, the variable is unset.
217 */
218
219void
492efe05 220setvar(const char *name, const char *val, int flags)
984263bc 221{
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222 const char *cp;
223 char *p;
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224 int len;
225 int namelen;
226 char *nameeq;
227 int isbad;
228
229 isbad = 0;
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230 cp = name;
231 if (!is_name(*cp))
984263bc 232 isbad = 1;
492efe05 233 cp++;
984263bc 234 for (;;) {
492efe05
CP
235 if (!is_in_name(*cp)) {
236 if (*cp == '\0' || *cp == '=')
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237 break;
238 isbad = 1;
239 }
492efe05 240 cp++;
984263bc 241 }
492efe05 242 namelen = cp - name;
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243 if (isbad)
244 error("%.*s: bad variable name", namelen, name);
245 len = namelen + 2; /* 2 is space for '=' and '\0' */
246 if (val == NULL) {
247 flags |= VUNSET;
248 } else {
249 len += strlen(val);
250 }
251 p = nameeq = ckmalloc(len);
492efe05 252 cp = name;
984263bc 253 while (--namelen >= 0)
492efe05 254 *p++ = *cp++;
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255 *p++ = '=';
256 *p = '\0';
257 if (val)
258 scopy(val, p);
259 setvareq(nameeq, flags);
260}
261
262STATIC int
492efe05 263localevar(const char *s)
984263bc 264{
492efe05 265 static const char * const lnames[7] = {
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266 "ALL", "COLLATE", "CTYPE", "MONETARY",
267 "NUMERIC", "TIME", NULL
268 };
492efe05 269 const char * const *ss;
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270
271 if (*s != 'L')
272 return 0;
273 if (varequal(s + 1, "ANG"))
274 return 1;
275 if (strncmp(s + 1, "C_", 2) != 0)
276 return 0;
277 for (ss = lnames; *ss ; ss++)
278 if (varequal(s + 3, *ss))
279 return 1;
280 return 0;
281}
282
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283/*
284 * Sets/unsets an environment variable from a pointer that may actually be a
285 * pointer into environ where the string should not be manipulated.
286 */
287static void
288change_env(char *s, int set)
289{
290 char *eqp;
291 char *ss;
292
293 ss = savestr(s);
294 if ((eqp = strchr(ss, '=')) != NULL)
295 *eqp = '\0';
296 if (set && eqp != NULL) {
297 if (setenv(ss, eqp + 1, 1) != 0)
298 error("setenv: cannot set %s=%s", ss, eqp + 1);
299 } else
300 unsetenv(ss);
301 ckfree(ss);
302}
303
304
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305/*
306 * Same as setvar except that the variable and value are passed in
307 * the first argument as name=value. Since the first argument will
308 * be actually stored in the table, it should not be a string that
309 * will go away.
310 */
311
312void
313setvareq(char *s, int flags)
314{
315 struct var *vp, **vpp;
316 int len;
317
318 if (aflag)
319 flags |= VEXPORT;
320 vpp = hashvar(s);
321 for (vp = *vpp ; vp ; vp = vp->next) {
322 if (varequal(s, vp->text)) {
323 if (vp->flags & VREADONLY) {
324 len = strchr(s, '=') - s;
325 error("%.*s: is read only", len, s);
326 }
327 INTOFF;
328
329 if (vp->func && (flags & VNOFUNC) == 0)
330 (*vp->func)(strchr(s, '=') + 1);
331
332 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
333 ckfree(vp->text);
334
335 vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
336 vp->flags |= flags;
337 vp->text = s;
338
339 /*
340 * We could roll this to a function, to handle it as
341 * a regular variable function callback, but why bother?
342 */
343 if (vp == &vmpath || (vp == &vmail && ! mpathset()))
344 chkmail(1);
345 if ((vp->flags & VEXPORT) && localevar(s)) {
5d0641a4 346 change_env(s, 1);
57fed2af 347 setlocale(LC_ALL, "");
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348 }
349 INTON;
350 return;
351 }
352 }
353 /* not found */
354 vp = ckmalloc(sizeof (*vp));
355 vp->flags = flags;
356 vp->text = s;
357 vp->next = *vpp;
358 vp->func = NULL;
359 INTOFF;
360 *vpp = vp;
361 if ((vp->flags & VEXPORT) && localevar(s)) {
5d0641a4 362 change_env(s, 1);
57fed2af 363 setlocale(LC_ALL, "");
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364 }
365 INTON;
366}
367
368
369
370/*
371 * Process a linked list of variable assignments.
372 */
373
374void
375listsetvar(struct strlist *list)
376{
377 struct strlist *lp;
378
379 INTOFF;
380 for (lp = list ; lp ; lp = lp->next) {
381 setvareq(savestr(lp->text), 0);
382 }
383 INTON;
384}
385
386
387
388/*
389 * Find the value of a variable. Returns NULL if not set.
390 */
391
392char *
492efe05 393lookupvar(const char *name)
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394{
395 struct var *v;
396
397 for (v = *hashvar(name) ; v ; v = v->next) {
398 if (varequal(v->text, name)) {
399 if (v->flags & VUNSET)
400 return NULL;
401 return strchr(v->text, '=') + 1;
402 }
403 }
404 return NULL;
405}
406
407
408
409/*
410 * Search the environment of a builtin command. If the second argument
411 * is nonzero, return the value of a variable even if it hasn't been
412 * exported.
413 */
414
415char *
492efe05 416bltinlookup(const char *name, int doall)
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417{
418 struct strlist *sp;
419 struct var *v;
420
421 for (sp = cmdenviron ; sp ; sp = sp->next) {
422 if (varequal(sp->text, name))
423 return strchr(sp->text, '=') + 1;
424 }
425 for (v = *hashvar(name) ; v ; v = v->next) {
426 if (varequal(v->text, name)) {
427 if ((v->flags & VUNSET)
428 || (!doall && (v->flags & VEXPORT) == 0))
429 return NULL;
430 return strchr(v->text, '=') + 1;
431 }
432 }
433 return NULL;
434}
435
436
437
438/*
439 * Generate a list of exported variables. This routine is used to construct
440 * the third argument to execve when executing a program.
441 */
442
443char **
444environment(void)
445{
446 int nenv;
447 struct var **vpp;
448 struct var *vp;
449 char **env, **ep;
450
451 nenv = 0;
452 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
453 for (vp = *vpp ; vp ; vp = vp->next)
454 if (vp->flags & VEXPORT)
455 nenv++;
456 }
457 ep = env = stalloc((nenv + 1) * sizeof *env);
458 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
459 for (vp = *vpp ; vp ; vp = vp->next)
460 if (vp->flags & VEXPORT)
461 *ep++ = vp->text;
462 }
463 *ep = NULL;
464 return env;
465}
466
467
468/*
469 * Called when a shell procedure is invoked to clear out nonexported
470 * variables. It is also necessary to reallocate variables of with
471 * VSTACK set since these are currently allocated on the stack.
472 */
473
474#ifdef mkinit
934863d7 475void shprocvar(void);
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476
477SHELLPROC {
478 shprocvar();
479}
480#endif
481
482void
483shprocvar(void)
484{
485 struct var **vpp;
486 struct var *vp, **prev;
487
488 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
489 for (prev = vpp ; (vp = *prev) != NULL ; ) {
490 if ((vp->flags & VEXPORT) == 0) {
491 *prev = vp->next;
492 if ((vp->flags & VTEXTFIXED) == 0)
493 ckfree(vp->text);
494 if ((vp->flags & VSTRFIXED) == 0)
495 ckfree(vp);
496 } else {
497 if (vp->flags & VSTACK) {
498 vp->text = savestr(vp->text);
499 vp->flags &=~ VSTACK;
500 }
501 prev = &vp->next;
502 }
503 }
504 }
505 initvar();
506}
507
508
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509static int
510var_compare(const void *a, const void *b)
511{
512 const char *const *sa, *const *sb;
513
514 sa = a;
515 sb = b;
516 /*
517 * This compares two var=value strings which creates a different
518 * order from what you would probably expect. POSIX is somewhat
519 * ambiguous on what should be sorted exactly.
520 */
521 return strcoll(*sa, *sb);
522}
523
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524
525/*
526 * Command to list all variables which are set. Currently this command
527 * is invoked from the set command when the set command is called without
528 * any variables.
529 */
530
531int
532showvarscmd(int argc __unused, char **argv __unused)
533{
534 struct var **vpp;
535 struct var *vp;
536 const char *s;
fab926b5
PA
537 const char **vars;
538 int i, n;
984263bc 539
fab926b5
PA
540 /*
541 * POSIX requires us to sort the variables.
542 */
543 n = 0;
544 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
545 for (vp = *vpp; vp; vp = vp->next) {
546 if (!(vp->flags & VUNSET))
547 n++;
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548 }
549 }
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550
551 INTON;
552 vars = ckmalloc(n * sizeof(*vars));
553 i = 0;
554 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
555 for (vp = *vpp; vp; vp = vp->next) {
556 if (!(vp->flags & VUNSET))
557 vars[i++] = vp->text;
558 }
559 }
560
561 qsort(vars, n, sizeof(*vars), var_compare);
562 for (i = 0; i < n; i++) {
563 for (s = vars[i]; *s != '='; s++)
564 out1c(*s);
565 out1c('=');
566 out1qstr(s + 1);
567 out1c('\n');
568 }
569 ckfree(vars);
570 INTOFF;
571
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572 return 0;
573}
574
575
576
577/*
578 * The export and readonly commands.
579 */
580
581int
582exportcmd(int argc, char **argv)
583{
584 struct var **vpp;
585 struct var *vp;
586 char *name;
587 char *p;
588 char *cmdname;
589 int ch, values;
590 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
591
592 cmdname = argv[0];
593 optreset = optind = 1;
594 opterr = 0;
595 values = 0;
596 while ((ch = getopt(argc, argv, "p")) != -1) {
597 switch (ch) {
598 case 'p':
599 values = 1;
600 break;
601 case '?':
602 default:
603 error("unknown option: -%c", optopt);
604 }
605 }
606 argc -= optind;
607 argv += optind;
608
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609 if (values && argc != 0)
610 error("-p requires no arguments");
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611 listsetvar(cmdenviron);
612 if (argc != 0) {
fab926b5 613 while ((name = *argv++) != NULL) {
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614 if ((p = strchr(name, '=')) != NULL) {
615 p++;
616 } else {
617 vpp = hashvar(name);
618 for (vp = *vpp ; vp ; vp = vp->next) {
619 if (varequal(vp->text, name)) {
620
621 vp->flags |= flag;
622 if ((vp->flags & VEXPORT) && localevar(vp->text)) {
5d0641a4 623 change_env(vp->text, 1);
57fed2af 624 setlocale(LC_ALL, "");
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625 }
626 goto found;
627 }
628 }
629 }
630 setvar(name, p, flag);
631found:;
632 }
633 } else {
634 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
635 for (vp = *vpp ; vp ; vp = vp->next) {
636 if (vp->flags & flag) {
637 if (values) {
638 out1str(cmdname);
639 out1c(' ');
640 }
641 for (p = vp->text ; *p != '=' ; p++)
642 out1c(*p);
643 if (values && !(vp->flags & VUNSET)) {
644 out1c('=');
645 out1qstr(p + 1);
646 }
647 out1c('\n');
648 }
649 }
650 }
651 }
652 return 0;
653}
654
655
656/*
657 * The "local" command.
658 */
659
660int
661localcmd(int argc __unused, char **argv __unused)
662{
663 char *name;
664
665 if (! in_function())
666 error("Not in a function");
667 while ((name = *argptr++) != NULL) {
668 mklocal(name);
669 }
670 return 0;
671}
672
673
674/*
675 * Make a variable a local variable. When a variable is made local, it's
676 * value and flags are saved in a localvar structure. The saved values
677 * will be restored when the shell function returns. We handle the name
678 * "-" as a special case.
679 */
680
681void
682mklocal(char *name)
683{
684 struct localvar *lvp;
685 struct var **vpp;
686 struct var *vp;
687
688 INTOFF;
689 lvp = ckmalloc(sizeof (struct localvar));
690 if (name[0] == '-' && name[1] == '\0') {
691 lvp->text = ckmalloc(sizeof optlist);
692 memcpy(lvp->text, optlist, sizeof optlist);
693 vp = NULL;
694 } else {
695 vpp = hashvar(name);
696 for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next);
697 if (vp == NULL) {
698 if (strchr(name, '='))
699 setvareq(savestr(name), VSTRFIXED);
700 else
701 setvar(name, NULL, VSTRFIXED);
702 vp = *vpp; /* the new variable */
703 lvp->text = NULL;
704 lvp->flags = VUNSET;
705 } else {
706 lvp->text = vp->text;
707 lvp->flags = vp->flags;
708 vp->flags |= VSTRFIXED|VTEXTFIXED;
709 if (strchr(name, '='))
710 setvareq(savestr(name), 0);
711 }
712 }
713 lvp->vp = vp;
714 lvp->next = localvars;
715 localvars = lvp;
716 INTON;
717}
718
719
720/*
721 * Called after a function returns.
722 */
723
724void
725poplocalvars(void)
726{
727 struct localvar *lvp;
728 struct var *vp;
729
730 while ((lvp = localvars) != NULL) {
731 localvars = lvp->next;
732 vp = lvp->vp;
733 if (vp == NULL) { /* $- saved */
734 memcpy(optlist, lvp->text, sizeof optlist);
735 ckfree(lvp->text);
736 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
57fed2af 737 unsetvar(vp->text);
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738 } else {
739 if ((vp->flags & VTEXTFIXED) == 0)
740 ckfree(vp->text);
741 vp->flags = lvp->flags;
742 vp->text = lvp->text;
743 }
744 ckfree(lvp);
745 }
746}
747
748
749int
750setvarcmd(int argc, char **argv)
751{
752 if (argc <= 2)
753 return unsetcmd(argc, argv);
754 else if (argc == 3)
755 setvar(argv[1], argv[2], 0);
756 else
757 error("List assignment not implemented");
758 return 0;
759}
760
761
762/*
763 * The unset builtin command. We unset the function before we unset the
764 * variable to allow a function to be unset when there is a readonly variable
765 * with the same name.
766 */
767
768int
769unsetcmd(int argc __unused, char **argv __unused)
770{
771 char **ap;
772 int i;
773 int flg_func = 0;
774 int flg_var = 0;
775 int ret = 0;
776
777 while ((i = nextopt("vf")) != '\0') {
778 if (i == 'f')
779 flg_func = 1;
780 else
781 flg_var = 1;
782 }
783 if (flg_func == 0 && flg_var == 0)
784 flg_var = 1;
785
786 for (ap = argptr; *ap ; ap++) {
787 if (flg_func)
788 ret |= unsetfunc(*ap);
789 if (flg_var)
790 ret |= unsetvar(*ap);
791 }
792 return ret;
793}
794
795
796/*
797 * Unset the specified variable.
798 */
799
800int
492efe05 801unsetvar(const char *s)
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802{
803 struct var **vpp;
804 struct var *vp;
805
806 vpp = hashvar(s);
807 for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
808 if (varequal(vp->text, s)) {
809 if (vp->flags & VREADONLY)
810 return (1);
811 INTOFF;
812 if (*(strchr(vp->text, '=') + 1) != '\0')
813 setvar(s, nullstr, 0);
814 if ((vp->flags & VEXPORT) && localevar(vp->text)) {
99130033 815 change_env(__DECONST(char *, s), 0);
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816 setlocale(LC_ALL, "");
817 }
818 vp->flags &= ~VEXPORT;
819 vp->flags |= VUNSET;
820 if ((vp->flags & VSTRFIXED) == 0) {
821 if ((vp->flags & VTEXTFIXED) == 0)
822 ckfree(vp->text);
823 *vpp = vp->next;
824 ckfree(vp);
825 }
826 INTON;
827 return (0);
828 }
829 }
31b6347c 830 return (0);
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831}
832
833
834
835/*
836 * Find the appropriate entry in the hash table from the name.
837 */
838
839STATIC struct var **
492efe05 840hashvar(const char *p)
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841{
842 unsigned int hashval;
843
844 hashval = ((unsigned char) *p) << 4;
845 while (*p && *p != '=')
846 hashval += (unsigned char) *p++;
847 return &vartab[hashval % VTABSIZE];
848}
849
850
851
852/*
853 * Returns true if the two strings specify the same varable. The first
854 * variable name is terminated by '='; the second may be terminated by
855 * either '=' or '\0'.
856 */
857
858STATIC int
492efe05 859varequal(const char *p, const char *q)
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860{
861 while (*p == *q++) {
862 if (*p++ == '=')
863 return 1;
864 }
865 if (*p == '=' && *(q - 1) == '\0')
866 return 1;
867 return 0;
868}